1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationRepresentation of process control engineering Requestsin P 35.240.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publ
2、ished under the authority of the StandardsPolicy and Strategy Committee on 31 May 2010.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 62424:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 03:02, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN
3、 62424 NORME EUROPENNE EUROPISCHE NORM August 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of ex
4、ploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62424:2009 E ICS 35.240.50; 25.040.40 English version Representation of process control engineering - Requests in P it shall not allow unguided automatic changes. The configurable checking step shall include
5、functionality for automatic or manual acceptance of data changes, allowing single decisions up to bulk data management. All changes in the proprietary database and all discovered data inconsistencies shall be reported by the import application. The generation of the report shall be configurable. The
6、 import/export application has to assure that the intersection of the different databases contains the same information, and that additional division specific data is handled in a consistent way. Data manipulation by a project division is an ongoing process during the whole project and beyond it. Th
7、us the creation, changing and deletion of data shall be possible during the life-cycle of the plant. CAEX databases have to be consistent. This requires a consistency check before exporting the data. This procedure has to be followed after a successful data manipulation in a P 2) mandatory fields be
8、ing filled in; 3) correct use of numbering system of the PCE requests. Inconsistent data shall not be exported. b) generate PCE relevant information; c) check for changed information in comparison with previously stored data in the neutral database; d) renaming of PCE request shall be supported by t
9、he export functionality; e) perform data export from proprietary into neutral database: 1) e. g. if the PCE request has been changed, the old PCE request within the neutral database has to be deleted and the new one shall be exported from the proprietary database into the neutral database. The old P
10、CE request information shall be stored in a backup storage system; 2) Other changes shall be performed with the existing object. f) generate reports after each data exchange: e. g. new PCE requests list, missing PCE requests list, changed PCE requests list, deleted PCE requests list, problems and er
11、ror list. Data import from neutral database into the target database shall comprise the following activities: g) generate PCE relevant information from neutral database; h) check for changed information by comparing the neutral database with the target database; i) perform data import from the neutr
12、al into the proprietary database; j) renaming of PCE request shall be supported by the import functionality; k) generate reports after each data exchange: 1) e. g. error lists; 2) inconsistencies due to imported data shall be detected by the target application during the import process and are not c
13、onsidered within this standard. 6 Representation of PCE requests in a P b) the graphical representation of PCE requests in a P c) the type of functional connection between the PCE requests: the control functions; d) the graphical representation of signals in a P&ID. In addition the reference designa
14、tion scheme used for PCE requests in a P&ID shall be specified. Detailed information on complex control functions shall not be part of the P&ID. Therefore, additional documentation (e.g. control narratives, function charts) has to be prepared to define the required functionality. A control function
15、shall also be individually identified and shall be represented on the P&ID. 6.3 Requirements for the identification and representation of PCE requests 6.3.1 General Each PCE request shall be graphically represented by a bubble, which collects all information about the functional requirements. Three
16、data fields inside and ten data fields outside the bubble are defined to hold all the information of a PCE request (see Figure 3). For detailed information see 6.3.3 to 6.3.9. USxxxx.3AH SHH AH SHH YS xxxx.4 AL OH PCE loop xxxx (optional) PCE request PCE control function aPCE request FIxxxx.2 TIxxxx
17、.1 PCE request BS EN 62424:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 03:02, Uncontrolled Copy, (c) BSI 18 62424 IEC:2008(E) Figure 3 General representation of a PCE-Request in a P&ID As stated before, only the PCE functionality shall be depicted on the P&ID, not the PCE i
18、mplementation. In exceptional cases however, there might be constellations where the presentation of detailed realization information is inevitable. For example, in the case of a multi-sensor element which means an instrument that produces measurements for different categories, every category shall
19、be represented by its own bubble. The bubbles are stacked up, as shown in Figure 4. Figure 4 Multi-sensor element In all cases where the PCE request is connected to the equipment or pipe, this shall be shown by a full line, connecting the bubble with the equipment or pipe. 6.3.2 Types of lines Signa
20、l lines are used to illustrate the functional relationship between PCE requests. A signal line shall be depicted as a dashed line with an arrow to indicate the information flow. Source of information flow shall be a bubble of a PCE control function or request or switching action consisting of the si
21、x fields right outside the bubble. The sink of information flow shall be a bubble of a PCE request or a control function. Process connections shall be depicted by a solid line without a direction. Multi-sensor instruments with only one process connection shall have an extra bubble for each category
22、and only one process connection. 6.3.3 Displaying the location of the operator interface Each PCE request is graphically represented by a bubble. This standard distinguishes the location of the operator interface between a local interface, a local control panel and a central control room. The locati
23、on does not reflect any realization in systems. A local interface shall be represented as shown in Figure 5. It could be e. g. a pressure gauge. PCE category and functionPCE IdentificationPU Vendor Typical ident. Device information ZHHHAHSHHALALLSLLLSafety relevant GMPQuality relevant (SIL3)DIxxxxFI
24、xxxxPIxxxxBS EN 62424:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 03:02, Uncontrolled Copy, (c) BSI62424 IEC:2008(E) 19 PIxxxxFigure 5 Local interface Operator action/information on a local control panel shall be represented as shown in Figure 6. HSxxxxFigure 6 Manually ope
25、rated switch in local control panel Remote requests operated in a central control room shall be represented as shown in Figure 7. PIxxxxFigure 7 Pressure indication in central control room 6.3.4 PCE categories and processing functions 6.3.4.1 Indication of PCE categories and processing functions The
26、 upper part of the bubble shall show the information of the PCE category and its PCE processing function. Each bubble shall have at least one PCE category and one PCE processing function. As exception for the processing function see 6.3.4.3. 6.3.4.2 PCE categories The first letter represents the PCE
27、 request and shall be selected from Table 2 if the measuring or initiating variable is listed in that Table. If this is not the case, a new category may be defined. A unique definition is recommended to provide for an automatic transfer to the specific equipment specification for the process control
28、 engineer. In case of amendments of categories of Table 2, a coding via letter X as described in table footnote b may be used. Modifying letters for the PCE category shall not be used to avoid misinterpretation in the course of automatic transfer to the specific equipment specification for the proce
29、ss control engineer. BS EN 62424:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 03:02, Uncontrolled Copy, (c) BSI 20 62424 IEC:2008(E) Table 2 PCE categories Letter PCE category A Analysis B Burner or combustion C a D Density E Voltage F Flow G Distance, length, position H Han
30、d or manual and manually initiated operation I Current J Power K Time based function L Level M Moisture or humidity N Actuation setting (motor) cO a P Pressure Q Quantity or counter R Radiation S Speed or frequency T Temperature U N.A. (see 6.3.10) V Vibration or mechanical analysis W Weight, mass,
31、force X b Y Actuation setting (valve) cZ a aThe definition of this letter should be defined by users. bThe unclassified letter X is intended to cover unlisted meanings that will be used only once or used to a limited extent. If used, the letter may have any number of meanings as a PCE category and a
32、ny number of meanings as a PCE function. cThe use of N for motor driven actuators and Y for valve actuators is based on different PCE activities and maintenance requirements for both types of actuators. Moreover, in the light of increased maintenance requirements in the plant, immediate identificati
33、on for transferring of data and relevant attributes of the actuator to asset management systems is necessary. 6.3.4.3 PCE processing functions Starting with the second character, the successive letters in the upper part of the bubble shall represent the processing function of the PCE request. The le
34、tters given in Table 3 shall be used to indicate the processing function of a PCE request. BS EN 62424:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 03:02, Uncontrolled Copy, (c) BSI62424 IEC:2008(E) 21 Table 3 PCE processing function Letter Processing function A Alarm, messa
35、ge B Restriction C Control D Difference E N.A . F Ratio G N.A. H High limit, on, opened I Indication of analogue values J N.A. K N.A. L Low limit, off, closed M N.A. N N.A. O Local or PCS status indication of binary signals P N.A. Q Integrating or counting R Recorded value S Binary control function
36、or switching function (not safety relevant) T N.A. U N.A. V N.A. W N.A. X b Y Computing function Z aBinary control function or switching function (safety relevant) aThe triangle may also be used to indicate in a redundant way that the processing function is safety relevant (see Figure 3). bThe uncla
37、ssified letter X is intended to cover unlisted meanings that will be used only once or used to a limited extent. If used, the letter may have any number of meanings as a PCE category and any number of meanings as a PCE function. The letters I and R refer to the result of the preceding processing fun
38、ction, e. g. FIQI means the indication of a flow and its quantity. The PCE processing functions A, H, L, O, S and Z shall only be used outside the bubble. In this case the PCE category may stand as a single value in the upper part of the bubble. In addition, a detailed definition for the signal info
39、rmation (see 6.3.2) to be transferred automatically to the control equipment specification for the process control engineer is given by this way. The combination of processing functions shall be used in the sequence given in Table 4. The table hierarchy shall be from left to right and per column top
40、 down. BS EN 62424:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 03:02, Uncontrolled Copy, (c) BSI 22 62424 IEC:2008(E) Table 4 Sequence combinations Category Sequence 1 2 3 4 See Table 3 1 F D Y C 2 B Q X - 6.3.4.4 PCE processing functions for actuators The PCE processing fu
41、nctions shall be used for actuators in the same way as for sensors. Some examples are shown in Table 5. Table 5 PCE processing functions for actuators Letter Processing function YS On/off valve YC Control valve YCS Control valve with on/off function YZ On/off valve (safety relevant) YIC Control valv
42、e continuous position indication NS On/off motor NC Control motor The valve operating mechanism, e. g. electric, pneumatic or hydraulic, is not specified by its presentation in the bubble in the P&ID. Graphical representation of the equipment valve including further functional details in the equipme
43、nt symbols in accordance to ISO 10628 in the P&ID cannot be used in the CAEX model. Such details shall be placed in the database. 6.3.5 PCE request reference designation scheme A reference designation scheme (e. g. IEC 61346-1) shall be used in order to identify the PCE request unambiguously. This i
44、dentification shall be independent of the PCE processing function of the PCE request and depicted in the lower part of the bubble. Preceding identification levels (e. g. site, plant, unit, area) may be omitted in the bubble if the request within the context of the P&ID is unique (see Figure 8). If P
45、CE requests are combined in a PCE loop, their identification shall have separated levels for the loop and the request. BS EN 62424:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 01/09/2010 03:02, Uncontrolled Copy, (c) BSI62424 IEC:2008(E) 23 XXXXNSUnit: uuuuArea: aaaaPlant: ppppMNOTE In
46、 the bubble of the depicted request only the last level of the identification system is shown. The plant, area and unit information can be taken from the lower left corner. Thus the complete identification of the request is: pppp-aaaa-uuuu-xxxx. Figure 8 Example of PCE request identification 6.3.6 P
47、U-vendor and typical identification If applicable, PU vendor information shall be given above the horizontal line, but outside the bubble on its upper left side, as shown in Figure 9. If this field is not used for PU vendor information, it may be used to show other project specific information. Figu
48、re 9 Example of flow measurement with indication in the CCR delivered by vendor A specified by typical A20 To support automatic loop, request and tag generation with PCE CAE tool requests, especially motor requests should be indicated by a “typical” number on the upper left side, outside the bubble.
49、 These “typicals” are fixed by the project-team and are used to determine the composition of the PCE request, e. g. how the motor drive should be switched (with start-stop only, with start-stop and running indication, with current measurement, etc.) or a combination of measuring systems. 6.3.7 Device information If, because of the PCE category, additional device information is needed (e.g. orifice for flow measurement), this shall be indicated in the lower zone outside the bubble on the left side (see Figure 1
